RFID tags and RFID transponders: form factors, chips and selection

An RFID tag is a data carrier made of a microchip and an antenna that transmits its identifier to a reader by radio. Transponder, tag, inlay and label describe the same technology in different physical forms. Choosing between hundreds of different RFID tags, transponders and labels can be a challenging task.

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How an RFID tag works

An RFID transponder or RFID label is the core element of any RFID system and enables the contactless identification of products, assets, or containers. It typically consists of a microchip and an antenna, integrated into a label, inlay, or robust tag housing. When an RFID reader emits radio frequency energy, the antenna of the transponder captures this energy and uses it to activate the chip. Passive RFID transponders, which are most commonly used in logistics and industrial applications, do not require a battery and are powered entirely by the reader’s electromagnetic field. How tag, reader and software work together as a whole is covered in the RFID technology basics.

Once activated, the transponder responds by transmitting its stored data—such as a unique ID or product-specific information—back to the reader using a process known as backscatter. This communication happens without line of sight and allows multiple RFID labels to be read simultaneously, even in motion. Depending on the RFID frequency (HF, NFC, or UHF), read ranges can vary from a few centimeters to several meters.

IDCRAFT supplies UHF | RAIN labels and hard tags as well as HF | NFC labels as well as RFID cards and key fobs, optimized for diverse materials, environments, and use cases. For custom-printed and encoded RFID labels and tags we run our own print and encoding service; for special housings we produce 3D-printed RFID transponders. Combined with the right RFID readers and system expertise, these solutions enable reliable identification, automation, and full transparency across the supply chain.

RFID chip: which chip for which purpose?

HF and NFC at 13.56 MHz. NTAG213, 215 and 216 are the standard chips for NDEF content with 144, 504 and 888 bytes of user memory respectively — the choice for product information, authentication and smart packaging. ICODE SLIX and SLIX2 under ISO 15693 read several transponders at once and reach further than ISO 14443; they are the standard in libraries and industrial laundry. Access control and credentials typically use MIFARE families with cryptographic protection.

UHF and RAIN at 865 to 868 MHz in Europe. The governing standard is EPC Gen2v2 under ISO 18000-63. Common chips come from Impinj (M700 series), NXP (UCODE) and Alien. Memory is split into banks: the TID carries an immutable factory serial number, EPC memory holds the programmable identifier such as an SGTIN-96 built from GTIN and serial, and user memory is available for your own data.

The chip decides more than storage. It determines whether the tag can be locked, whether it can be cryptographically authenticated, whether it delivers sensor data, and how sensitive it is to metal and liquids. These questions belong at the start of a project, not at the end.

RFID chips compared: memory, standard, use

NTAG213, NTAG215, NTAG216 (NXP): NFC Forum Type 2, ISO 14443 A; 144, 504 and 888 bytes of user memory. For NFC labels, product information and smartphone interaction.
MIFARE Classic 1K/4K (NXP): ISO 14443 A; 1 KB and 4 KB, Crypto-1. For existing access and time-recording systems, no longer recommended for new installations.
MIFARE DESFire EV2/EV3 (NXP): ISO 14443 A; 2 to 8 KB (EV3 also 16 KB), AES-128, several applications. For access, credentials and payment with security requirements.
ICODE SLIX/SLIX2 (NXP): ISO 15693; 896 and 2,528 bits. For libraries, laundry and bulk reading in the HF range.
UCODE 8/9 (NXP): EPC Gen2v2, ISO 18000-63; EPC 96 to 128 bits, high read sensitivity. For labels and hard tags in logistics and retail.
Impinj M730/M750/M770 and M830/M850: EPC Gen2v2; EPC 96 to 128 bits, some with a small user memory. For labels in retail, logistics and manufacturing.
Alien Higgs 3/9: EPC Class 1 Gen2, ISO 18000-6C; Higgs 3 with 512 bits of user memory, Higgs 9 as its successor with higher sensitivity. For small hard tags and on-metal tags.

The form factors compared

Label and inlay: mostly UHF, up to several metres; thin, printable and encodable in the printer. For logistics, retail and inventory. Examples: CT RFID Label, CT ECO LABEL, HID IQ Pro Label.
Hard tag: UHF, up to several metres depending on build; plastic or epoxy housing, resistant to impact, chemicals and heat. For containers, tools and equipment. Examples: Xerafy Roswell, Xerafy TRAK, HID Adept Tag, for kegs and gas cylinders the HID Exo Keg Tag.
On-metal tag: UHF, several metres on metal; the design uses the metal surface as its antenna, and the smaller the tag, the shorter the range. For metal parts, machines and IT assets. Examples: HID IQ On-Metal, Xerafy Metal Skin, Xerafy Micro Tag, Xerafy Pico Tag, Xerafy XS Series.
Card: HF and NFC, a few centimetres; ISO card format, printable, can be combined with a contact chip or magnetic stripe. For access, time recording, employee badges, charging cards and payment. Examples: CT RFID Cards, for access with PKI the ACS ACOS5-EVO.
Key fob and wristband: HF and NFC, a few centimetres; rugged, on a keyring or wrist, personalised by engraving or print. For access, time recording, events and charging points. Examples: CT ABS Keyfob, CT Epoxy Keyfob, CT PVC Keyfob.
Laundry tag: UHF or HF; sewn in, ironed on or fixed to the laundry cage, wash-resistant over many cycles. For laundries, healthcare and hospitality. Examples: Xerafy Tex Trak, CT Laundry Tag, HID Cage SlimTRAK.
Disc tag and cable tie tag: HF and NFC, a few centimetres; round, for gluing or embedding, or fixed with a cable tie or clamp. For tools, containers and cables. Examples: CT ABS Disctags, CT Clear Disctags, CT Cable Tie Tag.
3D tag (custom form factor): UHF or HF; printed from PLA or ABS, shape and marking free. For installation spaces and quantities where no standard tag and no injection moulding fit. Example: RFID 3D Tag.

Metal and liquids change behaviour far more than any datasheet figure suggests. A tag that reads eight metres in free air can drop to zero on a steel container. So the rule for every selection is: test it in the real mounting position, not on a desk.

All 379 UHF transponders from our range can be filtered by surface, read range, temperature and memory in the UHF Tag Finder.

Buying RFID tags: categories and shop

UHF RFID tags and labels: labels, hard tags and on-metal tags for logistics and industry, many with price and availability in the IDCRAFT Shop, such as the CT RFID Label, Xerafy Micro Tag and Xerafy Roswell.
HF/NFC RFID tags and labels: disc tags, cable tie tags, laundry tags and NFC labels for tools, textiles and packaging.
RFID cards and key fobs: credentials and key fobs, the CT RFID Cards with price in the shop.
Printed and encoded labels from a single piece via our printing service; project quantities, samples and custom form factors on request.

Matching transponders from the portfolio

Cards: CT RFID Cards, the ACS PocketKey NFC Card with FIDO2 and ISO 14443 Type A, and the ACS ACOS5-EVO with ISO 7816 and cryptographic protection.

Key fobs: CT PVC Keyfob, CT ABS Keyfob and CT Epoxy Keyfob, each available with various HF | NFC chips.

Labels: the CT RFID Label with chips from Impinj, NXP or Alien, the CT ECO LABEL with 90 percent less plastic at the same performance, and the HID IQ Pro Label.

Industrial and on-metal: HID IQ On-Metal, Xerafy Metal Skin, the Xerafy Micro Tag for tight spaces and the CT Flag Tag for high-value items.

Custom form factors are made in house: the RFID 3D Tag is printed from PLA or ABS with either a UHF or an HF chip, and its shape and marking can be adapted freely.

Full lists are available under RFID labels and UHF | RAIN transponders, HF | NFC tags and RFID cards and key fobs.

What types of RFID Transponder are existing?

RFID Card

RFID cards enable secure, contactless identification for access control, time tracking, and authentication. They offer fast reading, high reliability, and seamless integration into modern security and RFID systems across industries.

RFID Keyfob

RFID keyfob provide secure, contactless identification for events, access control, cashless payments, and tracking. Durable and comfortable, they enable fast authentication, improve user experience, and integrate seamlessly into modern RFID systems.

RFID Industrial Tag

RFID industrial tags are designed for harsh environments, enabling reliable asset tracking, identification, and process automation. Resistant to heat, metal, chemicals, and impact, they ensure long-term performance in industrial RFID applications.

RFID Label

RFID labels enable efficient, contactless identification and tracking of products, assets, and logistics units. They support fast data capture, improve inventory accuracy, and integrate seamlessly into modern RFID and supply chain systems.

Common questions around RFID Transponder, Tag and Label!

Can RFID Tags store more than just an ID number?

Yes. Depending on the chip, RFID Tags can include user memory for additional data, cryptographic features for authentication, or sensor capabilities. The best choice depends on your process and threat model. IDCRAFT supports you with an application-driven tag selection rather than a one-size-fits-all approach.

What affects RFID transponder read range the most?

Read range is influenced by frequency, antenna size and tuning, reader output power, tag orientation, and the surrounding materials (metal and liquids can strongly change performance). For reliable results, you should test transponders in the real mounting situation. IDCRAFT can provide test samples and help interpret results.

What is an RFID Label, and how is it used in operations?

An RFID Label is a thin, printable tag format typically used on packaging, documents, and assets. It combines an antenna and chip in a label construction that can be encoded and, if needed, printed with human-readable data or barcodes. IDCRAFT provides RFID Label options across different materials and adhesives to match your application.

How do I choose between simple NFC tags and secure NFC credentials?

Simple NFC tags are cost-effective for identification and information sharing, but they are not intended for high-security authentication. Secure credentials provide cryptographic mechanisms to resist cloning and enable robust access control. IDCRAFT can help you select the appropriate NFC Tags and reader combination based on your risk profile and compliance requirements.

Can NFC Tags be embedded into products or packaging?

Yes. NFC Tags can be delivered as labels, inlays, cards, key fobs, or custom form factors that integrate into products. The best construction depends on your manufacturing process and required durability. IDCRAFT can support tag selection for embedded designs and help you validate read behavior in the final product.

Samples, pricing and advice

Which tag reads reliably in your environment is something only a trial shows. That is why every project starts with samples.

Sample sets across several form factors and chips, so variants can be compared in the same setup.
Volume pricing from project quantities, with a calculation basis for rollouts.
Vendor-independent advice across the portfolio: ACS, CCL Faubel, CT, HID, RFCAMP, Xerafy and others.
Encoding and printing service for labels, plus custom 3D-printed form factors made in house.

Tell us what needs to be identified, what material it sits on and from what distance it must be read. We will propose form factor and chip and provide the samples.

Why choosing IDCRAFT as an Partner?

Choosing IDCRAFT means partnering with a reliable expert in Auto-ID, RFID and NFC technologies. IDCRAFT combines deep technical know-how with a strong portfolio of leading manufacturers, offering tailored hardware solutions for logistics, industry, retail and IoT applications.

From RFID readers and antennas to transponders, labels or industrial tags, IDCRAFT focuses on quality, compatibility and future-proof technologies. Customers benefit from independent consulting, fast availability and hardware that are precisely aligned with their operational requirements.

IDCRAFT understands that every RFID project is unique. That is why the company supports customers from initial technology selection through pilot phases and scalable rollouts. With a clear focus on innovation, standards compliance and practical hardware usability, IDCRAFT helps businesses optimize processes, increase transparency and unlock the full potential of RFID-based identification and tracking systems.

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